The interaction comes from when you touch the surface, which breaks the line of sight of the laser and is recognized as a touch just as if you might touch the trackpad on an Apple Macbook.

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Finding a lot of sources of information from diverse lines of thought on economics and having a better line of information on the Reagan 1986 tax legislation as it developed than most, peripherial, but almost daily interaction with the bank closings and later the RTC, gave me a whole different view.

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